I love to "race" other slow vehicles or bicycles, but the problem with the others on bikes is that I find they tend to blow stop signs or even red lights, and there's no way I'm gonna do that.
Actually, sometimes I wonder if I shouldn't try to pass others like this, because sometimes you can see their competitive fire light up, and they start to get reckless. I start to feel scared for them if they begin not slowing/stopping enough for safety.